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Título: | Differential survivorship of congeneric ornamental fishes under forecasted climate changes are related to anaerobic potential |
Autor: | Gonçalves, Luciana Mara Fé Silva, Maria de Nazaré Paula da Val, Adalberto Luis Val, Vera Maria Fonseca Almeida e |
Palavras-chave: | Carbon Dioxide Lactate Dehydrogenase Adult Anaerobic Glycolysis Characidae Climate Change Controlled Study Energy Environmental Exposure Environmental Temperature Enzyme Activity Gene Activation Gene Expression Microhabitat Nonhuman Ornamental Fish Paracheirodon Axelrodi Paracheirodon Simulans Phylogeny Survival Survivorship |
Data do documento: | 2018 |
Revista: | Genetics and Molecular Biology |
É parte de: | Volume 41, Número 1, Pags. 107-118 |
Abstract: | Two Amazonian closely related tetras – cardinal Paracheirodon axelrodi and green neon P. simulans – were artificially acclimatized to environmental chambers mimicking future climate change scenarios (mild, moderate and ex-treme), using a microcosm facility. P. simulans survived (100%) to all scenarios after 30 days exposure, while P. axelrodi presented decreasing survival percentages according to environmental severity. These differences may be the reflection of distinct natural acclimatization to microhabitats between the species, which differ in thermal conditions. Survival responses might be related to differences in relative gene expression of lactate dehydrogenase (Ldh), suggesting that P. axelrodi anaerobic potential is lower or non-existent compared to P. simulans, not tolerating long-term thermal challenges. Accordingly, increases in temperature and in CO2 levels caused increases in energy demand and resulted in activation of the anaerobic pathway, as demonstrated by the higher enzyme levels measured in head and tail portions of both species. Sustained anaerobic glycolysis is possible when fish live in challenging environments (low oxygen or high temperature). Our results clearly show that P. simulans has a larger scope for survival to higher energy demands due to its increased anaerobic potential compared to P. axelrodi. © 2018, Sociedade Brasileira de Genética. |
DOI: | 10.1590/1678-4685-gmb-2017-0016 |
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